I didn't answer. Although this is a Maryland area code, the caller id was "Brooklyn     NY".

Got call today--caller ID said Brooklyn, Maryland (there is such a place-it's near Baltimore). Tried to return call but operator said it was no longer in service. Really?

Caller calls several times within the month.  We have no idea who this is as we do not know of anyone in Baltimore. Caller times varies each time.  When we receive a call that is not familiar, we do not answer, nor call the number back as this confirms that your phone number is valid.  Our phone line is strictly for faxes for incoming job assignments only and has been that way for 28 years. I am thinking that this is a telemarketer.  My advice is not to call the person back.

Called Southern MD a few minutes ago.  Recorded message started by saying: this is not a sales call.  At that I hung up.

No caller ID at all on my phone.  With spoofing of phone numbers, there is no certainty that this call even originated in the US